Which statement about isotherms of a cubic EOS is true?
A. At Tr = 1.000 and any pressure, the first and second derivatives of P with respect to V will both be equal to zero.
B. When Tr< 0 the substance can be modeled as a VLE mixture inside the pressure dome.
C. Vc represents the critical molar volume and occurs at Tr and Pr.
D. It is possible for an isotherm to include some negative values of P.
E. None of these statements are true.
A. Incorrect. Both derivatives are zero only at the critical point, where both Tr = 1.000 andPr = 1.000.
B. Incorrect. A reduced temperature of zero represents absolute zero, so Tr< 0 is impossible.
C. Incorrect. Vc occurs at the critical point, Tc and Pc. Tr and Prcan be used to represent any temperature and pressure.
D. Correct. This is observed in some isotherms, though the section of the isotherm that falls below P=0 does not represent physical solutions for V.
E. Incorrect. One of them is true.
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